Overedge sewing and cutting machine.



G. M. ABERCROMBIE OVEREDGE SEWING AND CUTTING MACHINE.

APPLICATION FILED DEC. 4, 1913.

m W 5 0 y www- ATTORNEY UNITED STATES PATENT OFFICE.

CHARLES 1V1. ABERCR-OMBIE, OF BRIDGEPOBT, CONNECTICUT, ASSTGNOR- TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

OVEREDGE SEWING AND CUTTING MACHINE.

Specification of Letters Patent.

Patented May 26, 1914.

To all whom it may concern Be it known that I, CHARLES M. ABER- cnoMnIn, a citizen of the United States, residing at Bridgeport, in the county of Fairfi-eld and State of Connecticut, have invented certain new and useful Improvements in Overedge Sewing and Cutting Machines, of

which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in cutting mechanisms for two needle overedge or spoke-stitch sewing machines, and has for its object to improve the device for like purpose represented by 1,025,441, dated May 7, 1912 toapplicant, the present invention, as in the patent referred to, being shown in connection with the commercial spoke-stitch or double-hemstitch sewing machine represented by U. S. Patent to J. Walker, No. 634,970, dated Oct. 17, 1899.

As the present invention is not dependent upon any specific form of construction for giving to the needles and piercer their movements for producing slightly separated parallel rows of overedge stitching, only so much of the sewing machine proper has been illustrated as has been deemed essential for an understanding of its application.

In the accompanying drawings Figure 1, is a view in front end elevation of a portion of the sewing machine bed-plate and bracket-arm illustrated in the previously re ferred to patent, No. 634,970, together with the piercer, cloth-pressers, and cloth-pressercarrying bar, the cutting mechanism being shown in front side elevation mounted upon the cloth-presser-carrying bar. Figs. 2 and 3, front and rear side perspectives, respec tively, of the cutting mechanism detached from the machine. Fig. 4, a perspective of the throatplate. Fig. 5, a perspective of one form of production effected by the improved mechanism.

Referring to the figures, 1 represents the bed-plate of the sewing machine, 2 the bracket-arm, 3 the front slide plate, 4 the throat-plate, 5-5 the needles, 6 the needle carrying bar, and 7 the piercer carried by the bracket 8 secured by screw 9 on the piercer bar 10.

11 represents the cloth-presser bracket secured by screw 12 to the cloth-presser-carry- U. S. Patent No.-

ing bar 13, the bracket 11 being mounted to move vertically upon the bar 13 and held depressed by the spring 14, in a manner common to machines of the class herein referred to.

15 and 16 represent the commonly-em ployed rocking pressers.

To the lower end of the needle-carrying bar 6 is secured by clamp 17 and screws, as 18 one only of the latter being shown, a needle-bar bracket 19 to which are pivotally secured by screws, as 20, the needle brackets, as 21 one only of the latter and screws 20 being shown, said brackets being operatively connected through rods, as 22 one only of which is shown, with the actuating mechanism ofthe sewing machine to cause each needle to be moved sidewise to pierce the fabric in difierent vertical planes, thus causing each needle thread to be concatenated with each coacting under thread to form separate rows of stitches which are interlocked to form binding stitches as in the construction represented by Patent No. 634,970, previously referred to; and as in the construction of said patent, when the needles descend with the piercer to form the inner or edge stitches, said needles enter the opening formed by said piercer, thus eflecting the openwork or spoke-stitch seam.

The cutting mechanism comprises a main bracket 23 to the lower end of which is pivoted, bv stud-bolt 24 secured by screws 25, the lower shear-blade 26 the free end of which is preferably provided with a depending lug or teat 27, said blade being arranged parallel with the feed of the fabric and in line with and at the rear of the piercer 7, the upper end of said bracket having formed integral with it an arm 28 constituting a pinch-bracket for suspending the cutting mechanism upon the lower end of the clotlrpresser-carrying bar 13, a screw 29 serving to secure said arm upon said bar. 30 represents a wire spring which is led from a screw 31 around the inner end of the stud bolt 24, the opposite end of said wire entering a notch 32 formed in the blade 26 to hold the free end of the latter in con-tact with the throat-plate, as when the presserbar is moved vertically by the action of the commonly-employed four-motion feed-dogs or when manually elevated through the commonly-employed presser-bar lifting lever.

provided with the rib or incline 47.

In the construction represented by Patent No. 1,025,441, previously referred to, the lower shear-blade is formed integral with the bracket 32 of the patent, with the result that the free end of the blade follows the movements of the presser-bar which makes liable the entering of the fabric below the cutting mechanisms and to avoid this, in so far as the feed movements of the feed-dog control the vertical movements of the presser-bar, the throat-plate of the patent lits T e more important feature of the present construction is the providing of a pivotally mounted lower shear-blade whose free end is held, under all operative conditions, in contact with the throat-plate, in a manner to avoid all possibility of the fabric passing beneath the cutting mechanism.

33 represents a cutter-blade actuating-lever, pivoted on the stud-bolt 24, as is also the upper shear-blade 34, the latter secured to move with said lever by a lug 35 entering a notch 36 formed in said upper shearblade.

37 represents a lever-actuating-link secured by screws, as 38, to a depending lug 39 formed integral with a collar 40, which latter is secured upon the piercer-bar 10 by screw 41, the lower end of said link being forked to embrace the lever 33, a spring 42 acting to hold the outer end of the latter in operative relationship with the forked end of the link 37 at such time as the latter is being moved to its limit of upward stroke. The throat-plate 4 is provided with the usual feed-dog openings, as 43, needle and piercer opening 44, and preferably with a notch or opening 45 for the reception of the lug or teat 27 forming a part of the shear-blade 26.

In the operation of the device, when employed in connection with the stitch-forming and cloth-feeding mechanisms represented by Patent No. 634,970, the needles are given lateral or swinging movements back from the cutting line, as when forming the depth stitch 46, a distance sufiicient to insure that the clusters 47 of the threads forming the fabric 48 will be held bound together substantially as shown in Fig. 5.

Having thus set forth the nature of the invention, what I claim herein is 1. I11 a sewing machine, a stitch-forming mechanism including two needles each having sidewise movements to form parallel lines of stitches, a piercer having vertical movements to form openings in the fabric being acted on into which said needles descend in the formation of the inner lines of said stitches, a throat-plate and a cutting mechanism comprising pivotally mounted coacting blades arranged in a line corresponding to the direction of the feed of said fabric and operatively connected with the actuating mechanism of the sewing machine to sever said fabric at the rear of and in line with said piercer openings during the stitching operation, the free end of the lower of said blades being held in engagement with said throatplate independently of the vertical movements of its pivotal point.

2. In a sewing machine, a stitch-forming mechanism including two needles each having sidewise movements to form parallel lines of stitches, a piercer having vertical movements to form openings in the fabric being acted on into which said needles descend in the formation of the inner lines of said stitches, a throat-plate and a cutting mechanism comprising pivotally mounted coacting blades arranged in a line corresponding to the direction of the feed of said fabric and operatively connected with the piercer actuating mechanism to sever said fabric at the rear of and in line with said piercer openings during the stitching operation, the free end of the lower of said blades being held in engagement with said throatplate independently of the vertical movements of its pivotal point.

3. In a sewing machine, a stitch-forming mechanism including two needles each having sidewise movements to form parallel lines of stitches, a piercer having vertical movements to form openings in the fabric being acted on into which said needles descend in the formation of the inner lines of said stitches, a clothresser mechanism including a vertically movable cloth-presser carrying bar, a throat-plate and a cutting mechanism comprising pivotally mounted coacting blades secured to the lower end of said bar and arranged in a line corresponding to the direction of the feed of said fabric and operatively connected to the actuating mechanism of the sewing machine to sever said fabric at the rear of said piercer and in line with said piercer openings during the stitching operation, the free end of the lower of said blades being held in engagement with said throat-plate independently of the vertical movements of its pivotal point.

4. In a sewing machine, a stitch-formin mechanism including two needles each having sidewise movements to form vertical lines of stitches, a piercer having vertical movements to form openings in the fabric being acted on into which said needles descend in the formation of the inner lines of said stitches, a throat-plate provided with a notch, a cutting mechanism comprising pivotally mounted coacting blades arranged in a line corresponding to the direction of the feed of said fabric and operatively connected with the piercer actuating mechanism to sever said fabric at the rear of and in, line with said piercer openings, and a throat- In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

CHARLES M. ABERCROMBIE.

Witnesses:

FRANK M. VVOOTTON, JENNIE BRUNNERMAN.

plate provided with a notch over Which said fabric is advanced to said cutting mechanism, the free end of the lower of said blades being provided With a teat held in engagement with said notch independently of the vertical movements of the pivotal point of said blade.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

